Method and apparatus for transmitting reference signal in wireless communication system

ABSTRACT

A communication method and a system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with an internet of things (IoT) technology are provided, which may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method and an apparatus for transmitting a reference signal are provided. The method includes receiving, from a base station, a first parameter and a second parameter associated with a sound reference signal (SRS) by higher layer signaling, identifying a bandwidth for the SRS based on the first parameter and the second parameter, and transmitting, to the base station, the SRS based on the identified bandwidth for the SRS.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is based on and claims priority under 35 U.S.C. § 119of a Korean patent application number 10-2017-0127953, filed on Sep. 29,2017, in the Korean Intellectual Property Office, and of a Korean patentapplication number 10-2017-0151594, filed on Nov. 14, 2017, in theKorean Intellectual Property Office, the disclosure of each of which isincorporated by reference herein in its entirety.

BACKGROUND 1. Field

The disclosure relates to reference signal transmission in a mobilecommunication system. More particularly, the disclosure relates to atransmission method using multiple antennas in a mobile communicationsystem.

The disclosure further relates to reference signal transmission in amobile communication system, and more particularly to a method and anapparatus for a user equipment (UE) to transmit a sounding referencesignal (SRS) for channel state measurement.

2. Description of Related Art

In order to meet the demand for wireless data traffic that is on anincreasing trend after commercialization of fourth generation (4G)communication systems, efforts have been made to develop improved fifthgeneration (5G) or pre-5G communication system. For this reason, the 5Gor pre-5G communication system is also called a beyond 4G networkcommunication system or a post long-term evolution (LTE) system. Inorder to achieve high data rate, implementation of a 5G communicationsystem in an ultrahigh frequency (mmWave) band (e.g., like 60 GHz band)has been considered. In order to mitigate a path loss of radio waves andto increase a transfer distance of the radio waves in the ultrahighfrequency band, technologies of beamforming, massive multiple inputmultiple output (MIMO), full dimension MIMO (FD-MIMO), array antennas,analog beamforming, and large scale antennas for the 5G communicationsystem have been discussed. Further, for system network improvement inthe 5G communication system, technology developments have been made foran evolved small cell, advanced small cell, cloud radio access network(cloud RAN), ultra-dense network, device to device communication (D2D),wireless backhaul, moving network, cooperative communication,coordinated multi-points (CoMP), and reception interferencecancellation. In addition, in the 5G system, hybrid frequency shiftkeying (FSK) and quadrature amplitude modulation (QAM) modulation (FQAM)and sliding window superposition coding (SWSC), which correspond toadvanced coding modulation (ACM) systems, and filter bank multicarrier(FBMC), non-orthogonal multiple access (NOMA), and sparse code multipleaccess (SCMA), which correspond to advanced connection technologies,have been developed.

On the other hand, the Internet, which is a human centered connectivitynetwork where humans generate and consume information, is now evolvingto the Internet of things (IoT) where distributed entities, such asthings, exchange and process information. The Internet of everything(IoE), which is a combination of the IoT technology and big dataprocessing technology through connection with a cloud server, hasemerged. As technology elements, such as sensing technology,wired/wireless communication and network infrastructure, serviceinterface technology, and security technology, have been demanded forIoT implementation, a sensor network for machine-to-machine connection,machine-to-machine (M2M) communication, machine type communication(MTC), and so forth have been recently researched. Such an IoTenvironment may provide intelligent Internet technology (IT) servicesthat create a new value to human life by collecting and analyzing datagenerated among connected things. The IoT may be applied to a variety offields including smart home, smart building, smart city, smart car orconnected cars, smart grid, health care, smart appliances and advancedmedical services through convergence and combination between theexisting information technology (IT) and various industries.

Accordingly, various attempts have been made to apply the 5Gcommunication system to IoT networks. For example, technologies ofsensor network, machine to machine (M2M) communication, and machine typecommunication (MTC) have been implemented by techniques forbeam-forming, MIMO, and array antennas, which correspond to the 5Gcommunication technology. As the big data processing technology asdescribed above, application of a cloud radio access network (cloud RAN)would be an example of convergence between the 5G technology and the IoTtechnology.

On the other hand, since 5G communication is operated using thebandwidth part concept, it is necessary to design a new SRS bandwidthfor the 5G communication.

The above information is presented as background information only toassist with an understanding of the disclosure. No determination hasbeen made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the disclosure.

SUMMARY

Aspects of the disclosure are to address at least the above-mentionedproblems and/or disadvantages and to provide at least the advantagesdescribed below. Accordingly, an aspect of the disclosure is to providea method using a reference signal.

Another aspect of the disclosure is to provide a method for transmittinga user equipment (UE)-specific sounding reference signal (SRS) inconsideration of a UE bandwidth part.

Another aspect of the disclosure is to provide a method for defining anSRS bandwidth for supporting the SRS bandwidth extended to 272 RB.

Another aspect of the disclosure is to provide a method for adding anSRS bandwidth to a radio resource control (RRC) message forconfiguration for each UE in consideration of a UE-supportablebandwidth.

Another aspect of the disclosure is to provide a method for configuringa reference for a frequency position of an SRS using at least one of aUE bandwidth part (BWP) reference and a system bandwidth reference.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

In accordance with an aspect of the disclosure, a method of a userequipment (UE) in a wireless communication system is provided. Themethod includes receiving, from a base station, a first parameter and asecond parameter associated with a sound reference signal (SRS) byhigher layer signaling, identifying a bandwidth for the SRS based on thefirst parameter and the second parameter, and transmitting, to the basestation, the SRS based on the identified bandwidth for the SRS, whereinthe first parameter and the second parameter include UE-specificparameters.

In accordance with another aspect of the disclosure, a method of a basestation in a wireless communication system is provided. The methodincludes transmitting, to a user equipment (UE), a first parameter and asecond parameter associated with a sound reference signal (SRS) byhigher layer signaling; and receiving, from the UE, the SRS based on abandwidth for the SRS, the bandwidth being identified based on the firstparameter and the second parameter, wherein the first parameter and thesecond parameter include UE-specific parameters.

In accordance with another aspect of the disclosure, a user equipment(UE) in a wireless communication system is provided. The UE includes atransceiver and at least one processor operably connected to thetransceiver and configured to receive, from a base station, a firstparameter and a second parameter associated with a sound referencesignal (SRS) by higher layer signaling, identify a bandwidth for the SRSbased on the first parameter and the second parameter, and transmit, tothe base station, the SRS based on the identified bandwidth for the SRS,wherein the first parameter and the second parameter include UE-specificparameters.

In accordance with another aspect of the disclosure, a base station in awireless communication system is provided. The base station includes atransceiver, and at least one processor operably connected to thetransceiver and configured to transmit, to a user equipment (UE), afirst parameter and a second parameter by higher layer signaling, andreceive, from the UE, the SRS based on a bandwidth for the SRS, thebandwidth being identified based on the first parameter and the secondparameter, wherein the first parameter and the second parameter includeUE-specific parameters.

The technical subject matters to be achieved by the disclosure are notlimited to those as described above, and unmentioned or other technicalsubject matters will be clearly understood by those of ordinary skill inthe art to which the disclosure pertains from the following description.

According to the aspects of the disclosure, it is possible to provide amethod and an apparatus using a reference signal.

Further, according to the aspects of the disclosure, it is possible toallocate and transmit an SRS resource to in a UE-specific manner in caseof transmitting the SRS in consideration of a bandwidth part. Further,according to the aspects of the disclosure, unlike LTE, it is possibleto consider a UE bandwidth and a bandwidth in a bandwidth part withoutconsidering the system bandwidth.

Further, according to the aspects of the disclosure, the UE can receivethe SRS bandwidth (BW) and the UE SRS BW from the base station throughUE-specific signaling, receive the frequency position for transmittingthe SRS, and transmit the SRS to the base station.

Further, according to the aspects of the disclosure, it is possible todetermine the frequency position for transmitting the SRS based onfrequency information having an absolute value based on the systembandwidth.

Other aspects, advantages, and salient features of the disclosure willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainembodiments of the disclosure will be more apparent from the followingdescription taken in conjunction with the accompanying drawings, inwhich:

FIGS. 1A and 1B are diagrams explaining a method for configuring acell-specific sounding reference signal (SRS) parameter for SRSfrequency resource configuration and an SRS bandwidth through SRSbandwidth configuration (C_(SRS)) in long-term evolution (LTE) accordingto various embodiments of the disclosure;

FIG. 2 is a diagram illustrating an SRS bandwidth table according to anembodiment of the disclosure;

FIG. 3 is a diagram explaining a problem caused by quantized SRSbandwidth support according to an embodiment of the disclosure;

FIG. 4 is a diagram illustrating an operation of a base stationaccording to an embodiment of the disclosure;

FIG. 5 is a diagram illustrating an operation of a user equipment (UE)according to an embodiment of the disclosure;

FIG. 6 is a diagram illustrating an operation of a base station for asecond method for adjusting a frequency position of an SRS according toan embodiment of the disclosure;

FIG. 7 is a diagram illustrating an operation of a UE for a secondmethod for adjusting a frequency position of an SRS according to anembodiment of the disclosure;

FIG. 8 is a diagram illustrating the structure of a base stationaccording to an embodiment of the disclosure;

FIG. 9 is a diagram illustrating the structure of a UE according to anembodiment of the disclosure;

FIGS. 10A and 10B are diagrams illustrating another embodiment in whichan SRS bandwidth is extended up to 272 resource blocks (RB) based ontables illustrated in FIGS. 1A and 1B according to various embodimentsof the disclosure; and

FIGS. 11 and 12 are diagrams illustrating processes of a base stationand a UE to allocate an SRS using the table illustrated in FIGS. 10A and10B and to transmit and receive the allocated SRS according to variousembodiments of the disclosure.

Throughout the drawings, it should be noted that like reference numbersare used to depict the same or similar elements, features, andstructures.

DETAILED DESCRIPTION

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of variousembodiments of the disclosure as defined the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the various embodiments describedherein can be made without departing from the scope and spirit of thedisclosure. In addition, descriptions of well-known functions andconfigurations may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but, are merely used by theinventor to enable a clear and consistent understanding of thedisclosure. Accordingly, it should be apparent to those skilled in theart that the following description of various embodiments of thedisclosure is provided for illustration purpose only and not for thepurpose of limiting the disclosure as defined by the appended claims andtheir equivalents.

It is to be understood that the singular forms “a,” “an,” and “the”include plural referents unless the context clearly dictates otherwise.Thus, for example, reference to “a component surface” includes referenceto one or more of such surfaces.

In explaining embodiments of the disclosure, explanation of technicalcontents which are well known in the art to which the disclosurepertains and are not directly related to the disclosure will be omitted.This is to transfer the subject matter of the disclosure more clearlywithout obscuring the same through omission of unnecessary explanations.

For the same reason, in the accompanying drawings, some constituentelements may be exaggerated, omitted, or briefly illustrated. Further,sizes of the respective constituent elements do not completely reflectthe actual sizes thereof. In the drawings, the same drawing referencenumerals are used for the same or corresponding elements across variousfigures.

The aspects and features of the disclosure and methods for achieving theaspects and features will be apparent by referring to the embodiments tobe described in detail with reference to the accompanying drawings.However, the disclosure is not limited to the embodiments disclosedhereinafter, but can be implemented in diverse forms. The mattersdefined in the description, such as the detailed construction andelements, are nothing but specific details provided to assist those ofordinary skill in the art in a comprehensive understanding of thedisclosure, and the disclosure is only defined within the scope of theappended claims. In the entire description of the disclosure, the samedrawing reference numerals are used for the same elements across variousfigures.

In this case, it will be understood that each block of the flowchartillustrations, and combinations of blocks in the flowchartillustrations, can be implemented by computer program instructions.These computer program instructions can be provided to a processor of ageneral purpose computer, special purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the processor of the computer orother programmable data processing apparatus, create means forimplementing the functions specified in the flowchart block or blocks.These computer program instructions may also be stored in a computerusable or computer-readable memory that can direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer usable orcomputer-readable memory produce an article of manufacture includinginstruction means that implement the function specified in the flowchartblock or blocks. The computer program instructions may also be loadedonto a computer or other programmable data processing apparatus to causea series of operational steps to be performed on the computer or otherprogrammable apparatus to produce a computer implemented process suchthat the instructions that execute on the computer or other programmableapparatus provide steps for implementing the functions specified in theflowchart block or blocks.

Also, each block of the flowchart illustrations may represent a module,segment, or portion of code, which includes one or more executableinstructions for implementing the specified logical function(s). Itshould also be noted that in some alternative implementations, thefunctions noted in the blocks may occur out of the order. For example,two blocks shown in succession may in fact be executed substantiallyconcurrently or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved.

The term “˜unit”, as used in an embodiment, means, but is not limitedto, a software or hardware component, such as field programmable gatearray (FPGA) or application-specific integrated circuit (ASIC), whichperforms certain tasks. However, “˜unit” does not mean to be limited tosoftware or hardware. The term “˜unit” may advantageously be configuredto reside on the addressable storage medium and configured to execute onone or more processors. Thus, “˜unit” may include, by way of example,components, such as software components, object-oriented softwarecomponents, class components and task components, processes, functions,attributes, procedures, subroutines, segments of program code, drivers,firmware, microcode, circuitry, data, databases, data structures,tables, arrays, and variables. The functionality provided for in thecomponents and “˜units” may be combined into fewer components and“˜units” or further separated into additional components and “˜units”.Further, the components and “˜units” may be implemented to operate oneor more central processing units (CPUs) in a device or a securitymultimedia card.

Beamforming is a technology capable of expecting reduction ofunnecessary signal interferences by extending a transmission distancethrough concentration of an arrival area of radio waves in a specificdirection using two or more array antennas and by simultaneouslyreducing levels of signals received in directions excluding thecorresponding concentrated direction. In case of applying thebeamforming technology, it can be expected to increase service areas andto reduce interference signals. However, for this, it is necessary tomatch a beam direction between a base station and a user equipment (UE)in order to form an optimum beam. That is, it is required to seek thebeam direction having the optimum beam strength.

In case of a downlink, a periodic synchronization signal or aUE-specific channel state information-reference signal (CSI-RS) may beused as a training signal for the beamforming The CSI-RS has been usedas a downlink beam training signal in a full dimension multiple inputmultiple output (FD-MIMO).

However, in case of an uplink, a training signal for this has not beendefined. As an uplink beam training signal, a random access channel(RACH), a sounding reference signal (SRS), or a UL demodulationreference signal (UL DMRS) may be considered. However, among the abovesignals, the RACH and the UL DMRS do not have periodicity.

In case of the SRS, an SRS subframe that is actually transmitted by a UEis designated and transmitted through cell-specific SRS configurationand UE-specific SRS configuration in long-term evolution (LTE). Next, amethod for transmitting an SRS in LTE will be described in detail.

In LTE, cell-specific configuration for frequency configuration has beendefined as follows.

FIGS. 1A and 1B are diagrams explaining a method for configuring acell-specific SRS parameter for SRS frequency resource configuration andan SRS bandwidth through C_(SRS) in LTE according to various embodimentsof the disclosure.

Referring to FIGS. 1A and 1B, one of four tables is selected inaccordance with an uplink bandwidth, and in the selected table, an SRSbandwidth is determined in accordance with a C_(SRS) value. Accordingly,all UEs in a cell are allocated with the same SRS bandwidth, andtransmit an SRS within the allocated SRS bandwidth.

However, in 5G communication, an operation is performed using thebandwidth part concept. The bandwidth part is the concept that if the UEcapability cannot support the system bandwidth in the system bandwidth,a bandwidth that the UE can support can be configured and operated asthe bandwidth part. For example, if the bandwidth that the UE cansupport is 10 MHz and the system bandwidth is 100 MHz, the bandwidth isconfigured as a value that is smaller than 10 MHz that is the bandwidththat the UE can support, and the operation is performed therein.Accordingly, since the SRS is also unable to support the SRS bandwidthin accordance with the cell-specific configuration, the C_(SRS) istransmitted to respective UEs through the UE-specific configuration, andthe respective UEs are allocated with different SRS bandwidths to beoperated. Accordingly, it is required to design new SRS bandwidths forthe 5G communication. In order to design new SRS bandwidth allocation,the following matters should be considered. In FIGS. 1A and 1B, B_(SRS)indicates UE-specific SRS bandwidth. That is, in case of B_(SRS)=0, theUE transmits wideband SRS, and in case of B_(SRS)=3, the UE transmitsnarrow-band SRS. In case of the SRS bandwidth that is wider than that inLTE (e.g., 272 RB), it is required to determine up to how many B_(SRS)should be considered. Support of too small B_(SRS) may causeinsufficient granularity between the wideband SRS transmission and thenarrow-band SRS transmission. Since the UE-specific SRS bandwidthsupported by the B_(SRS) should be made as a multiple of the SRSbandwidth in the minimum unit, four kinds of B_(SRS) may be consideredin the same manner as the LTE. Further, it is preferable to design atable supporting from the minimum bandwidth (BW) to the maximum BWwithout defining a table in accordance with four kinds of uplinkbandwidths as in the LTE, and to support the SRS bandwidth in accordancewith UE capability.

FIG. 2 is a diagram illustrating an SRS bandwidth table according to anembodiment of the disclosure.

Referring to FIG. 2, an SRS bandwidth table is disclosed, which cansupport the SRS bandwidth that is unrelated to the UL bandwidth whilesupporting the SRS bandwidth that is wider than that in LTE. Asillustrated in FIG. 2, a UE previously shares UL bandwidth informationthat can be supported by the UE with a base station, and based on this,the base station allocates C_(SRS) and B_(SRS) to the UE in aUE-specific manner. In accordance with the C_(SRS) and the B_(SRS), theUE generates an SRS as long as the corresponding length, and performswideband SRS or narrow-band SRS transmission.

The table of FIG. 2 has been made to extend up to 272 RB based on thetable of FIGS. 1A and 1B. A new design is necessary for entriesexceeding 96 RB. As illustrated in FIG. 2, the entries exceeding 96 RBhave been designed for the following background. Each entry of B_(SRS)of each C_(SRS) has a multiple of 4. This is because an SRS resource ismade as a multiple of 4 RB. Further, values corresponding to m_(srs) andn of (B_(SRS)=n) should be selected as values that can be expressed asmultiplication of N_(n+1) and (m_(srs,n+1)) of (B_(SRS)=n+1). Here,exceptionally, 272 RB may be configured to include entries includingvalues that are not included in the entries that are smaller than 272RB.

In a scenario where a 5G system and LTE coexist, the following SRSbandwidth can be configured. All UEs in a cell may be allocated withcell-specific SRS bandwidths illustrated in FIGS. 1A and 1B through asystem information block (SIB). Here, if necessary, the UEs that operatethe UE-specific BW in consideration of the bandwidth part may update theSRS bandwidth through reception of the values illustrated in FIG. 2through UE-specific signaling.

In case of operating the SRS bandwidth based on the table of FIG. 2,signaling overhead can be reduced since all possible UE-specific BWs arenot supported. However, as quantization is performed based on the table,a problem that the whole UE BW is unable to be sounded may occur.

FIG. 3 is a diagram explaining a problem caused by quantized SRSbandwidth support according to an embodiment of the disclosure.

Referring to FIG. 3, a BW in accordance with UE capability may differfrom a BW in a bandwidth part (BWP) allocated by a base station. Thatis, the BW in the BWP is unable to be larger than the BW in accordancewith the UE capability. FIG. 3 shows a method for sounding the wholeband while supporting the quantized SRS bandwidth. The left figure inFIG. 3 shows a problem that the whole band channels are unable to beestimated due to the difference between the UE-specific B W and the SRSbandwidth allocated to the C_(SRS). Since the base station performsdownlink/uplink scheduling of the UE based on the channels estimatedthrough the SRS, it is very important to transmit the SRS through thewhole band. In order to solve this problem, the base station cantransmit information for adjusting the frequency position of the SRS tothe UE through the UE-specific signaling (downlink control indicator(DCI)/media access control (MAC) control element (CE)/radio resourcecontrol (RRC) signaling).

A first method for adjusting the frequency position of the SRS is amethod for transmitting the SRS so that the base station allocates aspecific offset to the UE and the UE can cover all the bands that cannotbe previously sounded by the UE as illustrated in FIG. 3.

FIGS. 4 and 5 are diagrams illustrating operations of a base station anda UE for transmitting an SRS using an offset according to variousembodiments of the disclosure.

FIG. 4 is a diagram illustrating an operation of a base stationaccording to an embodiment of the disclosure. Referring to FIG. 4, thebase station changes an SRS transmission frequency position using anoffset and receives an SRS based on the changed SRS transmissionfrequency.

Referring to FIG. 4, at operation 400, the base station may receivebandwidth capability information of UEs in a cell. That is, the UEnotifies the base station of the bandwidth information that can besupported by the UE. Base on this, the base station may configure abandwidth-in-bandwidth part, and may configure an SRS bandwidth (SRS BW)for transmitting the SRS based on this. At operation 410, the basestation may notify the UE of the configured SRS BW through the SIB orUE-specific signaling (RRC/MAC CE or DCI). At operation 420, the basestation may allocate a UE SRS BW for the UE to actually transmit the SRSthrough UE-specific SRS configuration. At operation 430, the basestation may determine whether an offset value for adjusting thefrequency position has been transferred to the UE when the UE transmitsthe SRS. For example, the offset value may be included in the RRCconfiguration that is transmitted to the UE at operations 410 and 420.Accordingly, if the UE receives the SRS configuration that includes thecorresponding offset value, it may generate the SRS in consideration ofthe offset from the time when it generates the SRS. Further, separatelyfrom the RRC configuration, the base station may transmit the offset tothe UE using DCI/MAC CE. Accordingly, the UE may generate the SRSthrough the RRC configuration, and during an actual transmission, it maydetermine whether to reflect the offset value from the DCI/MAC CE. Atoperation 430, if the base station transfers the offset value that isnot 0 to the UE in accordance with the determination of whether totransfer the offset value to the UE, it may receive the SRS transmittedby the UE through movement of the frequency as much as the offset valueat operation 440, whereas if the base station does not transfer theoffset value or allocates “0” as the offset value, it may receive theSRS in the same mariner as the existing method at operation 450.

FIG. 5 is a diagram illustrating an operation of a UE according to anembodiment of the disclosure. Referring to FIG. 5, the UE changes an SRStransmission frequency position using an offset and transmits an SRSbased on the changed SRS transmission frequency.

Referring to FIG. 5, at operation 500, the UE may receive the SRS BWfrom a base station through SIB or UE-specific signaling (RRC, DCI, orMAC CE). At operation 510, the UE may be allocated with the UE SRS BWfrom the base station through the UE-specific SRS configuration. Atoperation 520, the UE may identify whether an offset value for adjustingthe frequency position has been transferred from the base station whenthe UE transmits the SRS. The offset value may be included in the RRCconfiguration that is transmitted by the base station at operation 500or 510. Accordingly, if the UE receives the SRS configuration thatincludes the corresponding offset value from the base station, the UEmay generate the SRS in consideration of the offset value from the timewhen the UE generates the SRS. Further, separately from the RRCconfiguration, the UE may estimate the offset value using DCI/MAC CEtransmitted from the base station. Accordingly, the UE may generate theSRS through the RRC configuration of the SRS, and during an actualtransmission, it may determine whether to reflect the offset value fromthe DCI/MAC CE. At operation 520, if the UE estimates the transferredoffset value as an offset value that is not 0, it may transmit the SRSthrough movement of the frequency as much as the offset value atoperation 530. Here, the offset value may be configured in the unit ofHz, RB, or RE. If the offset value is not transferred or is allocated as“0” at operation 520, the UE, at operation 540, transmits the SRS in thesame manner as the existing method without applying the offset value.

A second method for adjusting the frequency position of the SRS is amethod in which the base station notifies the UE of start and endpositions for the UE to transmit the SRS. The base station may notifythe UE of the start and end positions for the UE to transmit the SRSusing a physical index based on the system bandwidth. Further, the basestation may notify the UE of the start and end positions for the UE totransmit the SRS using a logical RB index in the UE BW. As describedabove, the start and end positions for transmitting the SRS may benotified to the UE through the UE-specific signaling (DCI/MAC CE/RRCsignaling).

FIG. 6 is a diagram illustrating an operation of a base station for asecond method for adjusting a frequency position of an SRS according toan embodiment of the disclosure. Referring to FIG. 6, the base stationnotifies the UE of start and end positions of the frequency fortransmitting the SRS.

Referring to FIG. 6, at operation 600, the base station may receivebandwidth capability information of UEs in a cell. That is, the UEnotifies the base station of the bandwidth information that can besupported by the UE. Base on this, the base station may configure abandwidth-in-bandwidth part, and may configure an SRS bandwidth (SRS BW)for transmitting the SRS based on this. At operation 610, the basestation may notify the UE of the configured SRS BW through the SIB orUE-specific signaling (RRC/MAC CE or DCI). At operation 620, the basestation may allocate a UE SRS BW for the UE to actually transmit the SRSthrough UE-specific SRS configuration. At operation 630, the basestation may notify the UE of start and end positions through UE-specificsignaling so as to change the SRS transmission position of the UE. Here,the start and end positions for the UE to transmit the SRS may beexpressed as Hz, RE index, or RB index. At operation 640, the basestation may receive the SRS transmitted by the UE from the start and endpositions of the UE SRS BW allocated to the UE.

FIG. 7 is a diagram illustrating an operation of a UE for a secondmethod for adjusting a frequency position of an SRS according to anembodiment of the disclosure. Referring to FIG. 7, the UE transmits anSRS based on start and end position information of the frequency fortransmitting the SRS.

Referring to FIG. 7, at operation 700, the UE may receive an SRS BW froma base station through SIB or UE-specific signaling (RRC, DCI, or MACCE). At operation 710, the UE may be allocated with a UE SRS BW from thebase station through UE-specific SRS configuration. At operation 720,the UE may be allocated with the frequency position for the UE totransmit the SRS from the base station. The UE may be allocated with astart frequency position, an end position, or start and end positionsfor the UE to transmit the SRS from the base station through theUE-specific signaling. Such frequency information may be an absolutevalue based on physical PRB index 0 based on the system bandwidth. Thatis, based on the physical PRB index 0, Hz, RE index, or RB index may beallocated. Further, start and end values may be allocated based on theUE BW. That is, based on the UE BW RB index 0, Hz unit, RE, or RB indexmay be allocated. At operation 730, the UE transmits the SRS based onthe allocated start and end positions of the SRS.

The embodiments of FIGS. 4 and 6 can be embodied in combination, and itis also possible to combine partial operations of the embodiments ofFIGS. 5 and 7.

FIG. 8 is a diagram illustrating the structure of a base stationaccording to an embodiment of the disclosure.

Referring to FIG. 8, the base station may include a transceiver 810, acontroller 820 (e.g., at least one processor), and a storage 830 (e.g.,a memory). In an embodiment of the disclosure, the controller 820 may bedefined as a circuit, an application-specific integrated circuit, or atleast one processor. The transceiver 810 may transmit and receivesignals with other network entities. The controller 820 may control theoverall operation of the base station according to an embodimentproposed in the disclosure. The storage 830 may store at least one ofinformation transmitted and received through the transceiver 810 andinformation generated through the controller 820.

FIG. 9 is a diagram illustrating the structure of a UE according to anembodiment of the disclosure.

Referring to FIG. 9, the terminal may include a transceiver 910, acontroller 920 (e.g., at least one processor), and a storage 930 (e.g.,a memory). In an embodiment of the disclosure, the controller 920 may bedefined as a circuit, an application-specific integrated circuit, or atleast one processor. The transceiver 910 may transmit and receivesignals with other network entities. The controller 920 may control theoverall operation of the terminal according to an embodiment proposed inthe disclosure. The storage 930 may store at least one of informationtransmitted and received through the transceiver 910 and informationgenerated through the controller 920.

FIGS. 10A and 10B are diagrams illustrating another embodiment in whichan SRS bandwidth is extended up to 272 RB based on tables illustrated inFIGS. 1A and 1B according to various embodiments of the disclosure.

Referring to FIGS. 10A and 10B, in the same manner as the tableillustrated in FIG. 2, a new design is necessary for entries exceeding96 RB. The entries exceeding 96 RB have been designed for the followingbackground. Each entry of B_(SRS) of each C_(SRS) has a multiple of 4.This is because an SRS resource is made as a multiple of 4 RB. In thelast column B_(SRS)=3, 4 RB that is the minimum unit of SRS allocationis supported. Further, as the first feature of a network structure,values corresponding to m_(srs) and n of (B_(SRS)=n) should be selectedas values that can be expressed as multiplication of N_(n+1) and(m_(srs,n+1)) of (B_(SRS)=n+1). Further, in case of supporting 96 RB ormore, it is configured to have a network structure using the existingentries (96 RB or less). For example, in order to support 120 RB, 60 RBthat is a half thereof is supported, and support of 60 RB is configuredas defined in configuration index 11. Through this, the base station canminimize complexity of SRS detection when supporting a plurality ofentries. As described above, the values using the network structureapplied as elements in a new entry are selected through the reuse of thevalues in the existing entries among the entries having the values thatis equal to or larger than 96 RB and equal to or smaller than 272 RB,and the selected values are applied to SRS bandwidth configuration(31^(st), 37^(th), 47^(th), 48^(th), 54^(th), and 58^(th) indexes).Here, exceptionally, 272 RB may be configured to include the entriesincluding the values that are not included in the entries that aresmaller than 272 RB. Further, it is possible to support RB that issmaller than the RB supported by the bandwidth part and is a multiple of4 that is the largest value (20^(th), 33^(rd), 51^(st), and 60^(th)indexes). Through this, it is possible to estimate the SRS bandwidththat is closest to the bandwidth part. Further, it is possible toinclude the entries that can be divided by a multiple of 4 with respectto Bsrs=1,2,3 in consideration of the entries including a multiple of 8and a multiple of 16. FIG. 2 as described above is featured to includethe entries having the characteristics of the network structure/thesupport of the bandwidth of the bandwidth part/Bsrs=0 having a multipleof 8 or 16 and Bsrs=1,2,3 having a multiple of 4.

FIGS. 11 and 12 are diagrams illustrating processes of a base stationand a UE to allocate an SRS using the table illustrated in FIGS. 10A and10B, and to transmit and receive the allocated SRS according to variousembodiments of the disclosure.

Referring to FIGS. 11 and 12, the base station may receive maximumbandwidth capability information of UEs in a cell, and may configure abandwidth for transmitting an SRS at operation 1100.

The configured SRS bandwidth (SRS BW) may be configures as an index ofan SRS bandwidth configuration (C_(SRS)) in the table of FIGS. 10A and10B at operation 1110. Here, the SRS BW may be smaller than or equal tothe bandwidth that can be supported by the UE.

The base station may notify the UE of the UE SRS BW for notifying thelength of the SRS transmitted at a time by the UE using the tableillustrated in FIGS. 10A and 10B at operation 1120. If the UE SRS BW isequal to the SRS BW, the UE may transmit a periodic SRS once, whereas ifthe UE SRS BW is smaller than the SRS BW, the UE may transmit the SRSseveral times. For example, if the SRS BW is set to 120 RB, and the UESRS BW is set to 40 RB, the UE that transmits the periodic SRS cantransmit the SRS three times through frequency hopping, and thus thebase station is required to receive the SRS corresponding to this.

The base station can receive the SRS based on the allocated SRSbandwidth and the UE SRS BW at operation 1130.

Referring to FIG. 12, the UE may transmit bandwidth information that canbe supported by the UE in order for the base station to configure theSRS BW at operation 1200. Based on this information, the base stationmay configure a UE-specific SRS BW in consideration of the bandwidthpart.

The UE may receive the SRS bandwidth from the base station at operation1210. The SRS BW may be smaller than or equal to the maximum UEbandwidth at operation 1200. The SRS BW may be acquired using theC_(SRS) of the table illustrated in FIGS. 10A and 10B.

The UE may receive the UE SRS BW through the SRS bandwidth configurationat operation 1220. Here, the UE SRS BW may be smaller than or equal tothe SRS BW at operation 1210. The UE SRS BW may also be acquired throughthe table illustrated in FIGS. 10A and 10B.

The UE may transmit the SRS based on the allocated SRS BW and the UE SRSBW at operation 1230.

While the disclosure has been shown and described with reference tovarious embodiments thereof, it will be understood by those skilled inthe art that various changes in form and details may be made thereinwithout departing from the spirit and scope of the disclosure as definedby the appended claims and their equivalents.

What is claimed is:
 1. A method of a user equipment (UE) in a wirelesscommunication system, the method comprising: receiving, from a basestation, a first parameter and a second parameter associated with asound reference signal (SRS) by higher layer signaling; identifying abandwidth for the SRS based on the first parameter and the secondparameter; and transmitting, to the base station, the SRS based on theidentified bandwidth for the SRS, wherein the first parameter and thesecond parameter comprise UE-specific parameters.
 2. The method of claim1, further comprising: receiving, from the base station, offsetinformation by higher layer signaling, the offset information beingbased on a common resource block; and identifying a starting point forthe bandwidth based on the offset information, wherein the SRS istransmitted based on the bandwidth and the identified starting point. 3.The method of claim 1, wherein the bandwidth for the SRS includes up to272 resource blocks (RB).
 4. The method of claim 1, wherein a firstvalue of the first parameter indicates a first bandwidth set notincluding 272 resource blocks (RB) and a second value of the firstparameter indicates a second bandwidth set including 272 RB in apredetermined table, and wherein the first bandwidth set does notinclude a part of the second bandwidth set less than 272 RB.
 5. Themethod of claim 4, wherein the predetermined table comprises: B_(SRS) =0 B_(SRS) = 1 B_(SRS) = 2 B_(SRS) = 3 C_(SRS) m_(SRS, 0) N₀ m_(SRS, 1)N₁ m_(SRS, 2) N₂ m_(SRS, 3) N₃ 0 4 1 4 1 4 1 4 1 1 8 1 4 2 4 1 4 1 2 121 4 3 4 1 4 1 3 16 1 4 4 4 1 4 1 4 16 1 8 2 4 2 4 1 5 20 1 4 5 4 1 4 1 624 1 4 6 4 1 4 1 7 24 1 12 2 4 3 4 1 8 28 1 4 7 4 1 4 1 9 32 1 16 2 8 24 2 10 36 1 12 3 4 3 4 1 11 40 1 20 2 4 5 4 1 12 48 1 16 3 8 2 4 2 13 481 24 2 12 2 4 3 14 52 1 4 13 4 1 4 1 15 56 1 28 2 4 7 4 1 16 60 1 20 3 45 4 1 17 64 1 32 2 16 2 4 4 18 72 1 24 3 12 2 4 3 19 72 1 36 2 12 3 4 320 76 1 4 19 4 1 4 1 21 80 1 40 2 20 2 4 5 22 88 1 44 2 4 11 4 1 23 96 132 3 16 2 4 4 24 96 1 48 2 24 2 4 6 25 104 1 52 2 4 13 4 1 26 112 1 56 228 2 4 7 27 120 1 60 2 20 3 4 5 28 120 1 40 3 8 5 4 2 29 120 1 24 5 12 24 3 30 128 1 64 2 32 2 4 8 31 128 1 64 2 16 4 4 4 32 128 1 16 8 8 2 4 233 132 1 44 3 4 11 4 1 34 136 1 68 2 4 17 4 1 35 144 1 72 2 36 2 4 9 36144 1 48 3 24 2 12 2 37 144 1 48 3 16 3 4 4 38 144 1 16 9 8 2 4 2 39 1521 76 2 4 19 4 1 40 160 1 80 2 40 2 4 10 41 160 1 80 2 20 4 4 5 42 160 132 5 16 2 4 4 43 168 1 84 2 28 3 4 7 44 176 1 88 2 44 2 4 11 45 184 1 922 4 23 4 1 46 192 1 96 2 48 2 4 12 47 192 1 96 2 24 4 4 6 48 192 1 64 316 4 4 4 49 192 1 24 8 8 3 4 2 50 208 1 104 2 52 2 4 13 51 216 1 108 236 3 4 9 52 224 1 112 2 56 2 4 14 53 240 1 120 2 60 2 4 15 54 240 1 80 320 4 4 5 55 240 1 48 5 16 3 8 2 56 240 1 24 10 12 2 4 3 57 256 1 128 264 2 4 16 58 256 1 128 2 32 4 4 8 59 256 1 16 16 8 2 4 2 60 264 1 132 244 3 4 11 61 272 1 136 2 68 2 4 17 62 272 1 68 4 4 17 4 1 63 272 1 16 178 2 4 2


6. A method of a base station in a wireless communication system, themethod comprising: transmitting, to a user equipment (UE), a firstparameter and a second parameter associated with a sound referencesignal (SRS) by higher layer signaling; and receiving, from the UE, theSRS based on a bandwidth for the SRS, the bandwidth being identifiedbased on the first parameter and the second parameter, wherein the firstparameter and the second parameter comprise UE-specific parameters. 7.The method of claim 6, further comprising: transmitting, to the UE,offset information by higher layer signaling, the offset informationbeing based on a common resource block, wherein the SRS is receivedbased on the bandwidth and a starting point for the bandwidth, thestarting point being identified based on the offset information.
 8. Themethod of claim 6, wherein the bandwidth for the SRS includes up to 272resource blocks (RB).
 9. The method of claim 6, wherein a first value ofthe first parameter indicates a first bandwidth set not including 272resource blocks (RB) and a second value of the first parameter indicatesa second bandwidth set including 272 RB in a predetermined table, andwherein the first bandwidth set does not include a part of the secondbandwidth set less than 272 RB.
 10. The method of claim 9, wherein thepredetermined table comprises: B_(SRS) = 0 B_(SRS) = 1 B_(SRS) = 2B_(SRS) = 3 C_(SRS) m_(SRS, 0) N₀ m_(SRS, 1) N₁ m_(SRS, 2) N₂ m_(SRS, 3)N₃ 0 4 1 4 1 4 1 4 1 1 8 1 4 2 4 1 4 1 2 12 1 4 3 4 1 4 1 3 16 1 4 4 4 14 1 4 16 1 8 2 4 2 4 1 5 20 1 4 5 4 1 4 1 6 24 1 4 6 4 1 4 1 7 24 1 12 24 3 4 1 8 28 1 4 7 4 1 4 1 9 32 1 16 2 8 2 4 2 10 36 1 12 3 4 3 4 1 1140 1 20 2 4 5 4 1 12 48 1 16 3 8 2 4 2 13 48 1 24 2 12 2 4 3 14 52 1 413 4 1 4 1 15 56 1 28 2 4 7 4 1 16 60 1 20 3 4 5 4 1 17 64 1 32 2 16 2 44 18 72 1 24 3 12 2 4 3 19 72 1 36 2 12 3 4 3 20 76 1 4 19 4 1 4 1 21 801 40 2 20 2 4 5 22 88 1 44 2 4 11 4 1 23 96 1 32 3 16 2 4 4 24 96 1 48 224 2 4 6 25 104 1 52 2 4 13 4 1 26 112 1 56 2 28 2 4 7 27 120 1 60 2 203 4 5 28 120 1 40 3 8 5 4 2 29 120 1 24 5 12 2 4 3 30 128 1 64 2 32 2 48 31 128 1 64 2 16 4 4 4 32 128 1 16 8 8 2 4 2 33 132 1 44 3 4 11 4 1 34136 1 68 2 4 17 4 1 35 144 1 72 2 36 2 4 9 36 144 1 48 3 24 2 12 2 37144 1 48 3 16 3 4 4 38 144 1 16 9 8 2 4 2 39 152 1 76 2 4 19 4 1 40 1601 80 2 40 2 4 10 41 160 1 80 2 20 4 4 5 42 160 1 32 5 16 2 4 4 43 168 184 2 28 3 4 7 44 176 1 88 2 44 2 4 11 45 184 1 92 2 4 23 4 1 46 192 1 962 48 2 4 12 47 192 1 96 2 24 4 4 6 48 192 1 64 3 16 4 4 4 49 192 1 24 88 3 4 2 50 208 1 104 2 52 2 4 13 51 216 1 108 2 36 3 4 9 52 224 1 112 256 2 4 14 53 240 1 120 2 60 2 4 15 54 240 1 80 3 20 4 4 5 55 240 1 48 516 3 8 2 56 240 1 24 10 12 2 4 3 57 256 1 128 2 64 2 4 16 58 256 1 128 232 4 4 8 59 256 1 16 16 8 2 4 2 60 264 1 132 2 44 3 4 11 61 272 1 136 268 2 4 17 62 272 1 68 4 4 17 4 1 63 272 1 16 17 8 2 4 2


11. A user equipment (UE) in a wireless communication system, the UEcomprising: a transceiver; and at least one processor operably connectedto the transceiver and configured to: control the transceiver toreceive, from a base station, a first parameter and a second parameterassociated with a sound reference signal (SRS) by higher layersignaling, identify a bandwidth for the SRS based on the first parameterand the second parameter, and control the transceiver to transmit, tothe base station, the SRS based on the identified bandwidth for the SRS,wherein the first parameter and the second parameter compriseUE-specific parameters.
 12. The UE of claim 11, wherein the at least oneprocessor is further configured to: control the transceiver to receive,from the base station, offset information by higher layer signaling, theoffset information being based on a common resource block, and identifya starting point for the bandwidth based on the offset information, andwherein the SRS is transmitted based on the bandwidth and the identifiedstarting point.
 13. The UE of claim 11, wherein the bandwidth for theSRS includes up to 272 resource blocks (RB).
 14. The UE of claim 11,wherein a first value of the first parameter indicates a first bandwidthset not including 272 resource blocks (RB) and a second value of thefirst parameter indicates a second bandwidth set including 272 RB in apredetermined table, and wherein the first bandwidth set does notinclude a part of the second bandwidth set less than 272 RB.
 15. The UEof claim 14, wherein the predetermined table comprises: B_(SRS) = 0B_(SRS) = 1 B_(SRS) = 2 B_(SRS) = 3 C_(SRS) m_(SRS, 0) N₀ m_(SRS, 1) N₁m_(SRS, 2) N₂ m_(SRS, 3) N₃ 0 4 1 4 1 4 1 4 1 1 8 1 4 2 4 1 4 1 2 12 1 43 4 1 4 1 3 16 1 4 4 4 1 4 1 4 16 1 8 2 4 2 4 1 5 20 1 4 5 4 1 4 1 6 241 4 6 4 1 4 1 7 24 1 12 2 4 3 4 1 8 28 1 4 7 4 1 4 1 9 32 1 16 2 8 2 4 210 36 1 12 3 4 3 4 1 11 40 1 20 2 4 5 4 1 12 48 1 16 3 8 2 4 2 13 48 124 2 12 2 4 3 14 52 1 4 13 4 1 4 1 15 56 1 28 2 4 7 4 1 16 60 1 20 3 4 54 1 17 64 1 32 2 16 2 4 4 18 72 1 24 3 12 2 4 3 19 72 1 36 2 12 3 4 3 2076 1 4 19 4 1 4 1 21 80 1 40 2 20 2 4 5 22 88 1 44 2 4 11 4 1 23 96 1 323 16 2 4 4 24 96 1 48 2 24 2 4 6 25 104 1 52 2 4 13 4 1 26 112 1 56 2 282 4 7 27 120 1 60 2 20 3 4 5 28 120 1 40 3 8 5 4 2 29 120 1 24 5 12 2 43 30 128 1 64 2 32 2 4 8 31 128 1 64 2 16 4 4 4 32 128 1 16 8 8 2 4 2 33132 1 44 3 4 11 4 1 34 136 1 68 2 4 17 4 1 35 144 1 72 2 36 2 4 9 36 1441 48 3 24 2 12 2 37 144 1 48 3 16 3 4 4 38 144 1 16 9 8 2 4 2 39 152 176 2 4 19 4 1 40 160 1 80 2 40 2 4 10 41 160 1 80 2 20 4 4 5 42 160 1 325 16 2 4 4 43 168 1 84 2 28 3 4 7 44 176 1 88 2 44 2 4 11 45 184 1 92 24 23 4 1 46 192 1 96 2 48 2 4 12 47 192 1 96 2 24 4 4 6 48 192 1 64 3 164 4 4 49 192 1 24 8 8 3 4 2 50 208 1 104 2 52 2 4 13 51 216 1 108 2 36 34 9 52 224 1 112 2 56 2 4 14 53 240 1 120 2 60 2 4 15 54 240 1 80 3 20 44 5 55 240 1 48 5 16 3 8 2 56 240 1 24 10 12 2 4 3 57 256 1 128 2 64 2 416 58 256 1 128 2 32 4 4 8 59 256 1 16 16 8 2 4 2 60 264 1 132 2 44 3 411 61 272 1 136 2 68 2 4 17 62 272 1 68 4 4 17 4 1 63 272 1 16 17 8 2 42


16. A base station in a wireless communication system, the base stationcomprising: a transceiver; and at least one processor operably connectedto the transceiver and configured to control the transceiver to:transmit, to a user equipment (UE), a first parameter and a secondparameter by higher layer signaling, and receive, from the UE, soundreference signal (SRS) based on a bandwidth for the SRS, the bandwidthbeing identified based on the first parameter and the second parameter,wherein the first parameter and the second parameter compriseUE-specific parameters.
 17. The base station of claim 16, wherein the atleast one processor is further configured to control the transceiver totransmit, to the UE, offset information by higher layer signaling, theoffset information being based on a common resource block, and whereinthe SRS is received based on the bandwidth and a starting point for thebandwidth, the starting point being identified based on the offsetinformation.
 18. The base station of claim 16, wherein the bandwidth forthe SRS includes up to 272 resource blocks (RB).
 19. The base station ofclaim 16, wherein a first value of the first parameter indicates a firstbandwidth set not including 272 resource blocks (RB) and a second valueof the first parameter indicates a second bandwidth set including 272 RBin a predetermined table, and wherein the first bandwidth set does notinclude a part of the second bandwidth set less than 272 RB.
 20. Thebase station of claim 19, wherein the predetermined table comprises:B_(SRS) = 0 B_(SRS) = 1 B_(SRS) = 2 B_(SRS) = 3 C_(SRS) m_(SRS, 0) N₀m_(SRS, 1) N₁ m_(SRS, 2) N₂ m_(SRS, 3) N₃ 0 4 1 4 1 4 1 4 1 1 8 1 4 2 41 4 1 2 12 1 4 3 4 1 4 1 3 16 1 4 4 4 1 4 1 4 16 1 8 2 4 2 4 1 5 20 1 45 4 1 4 1 6 24 1 4 6 4 1 4 1 7 24 1 12 2 4 3 4 1 8 28 1 4 7 4 1 4 1 9 321 16 2 8 2 4 2 10 36 1 12 3 4 3 4 1 11 40 1 20 2 4 5 4 1 12 48 1 16 3 82 4 2 13 48 1 24 2 12 2 4 3 14 52 1 4 13 4 1 4 1 15 56 1 28 2 4 7 4 1 1660 1 20 3 4 5 4 1 17 64 1 32 2 16 2 4 4 18 72 1 24 3 12 2 4 3 19 72 1 362 12 3 4 3 20 76 1 4 19 4 1 4 1 21 80 1 40 2 20 2 4 5 22 88 1 44 2 4 114 1 23 96 1 32 3 16 2 4 4 24 96 1 48 2 24 2 4 6 25 104 1 52 2 4 13 4 126 112 1 56 2 28 2 4 7 27 120 1 60 2 20 3 4 5 28 120 1 40 3 8 5 4 2 29120 1 24 5 12 2 4 3 30 128 1 64 2 32 2 4 8 31 128 1 64 2 16 4 4 4 32 1281 16 8 8 2 4 2 33 132 1 44 3 4 11 4 1 34 136 1 68 2 4 17 4 1 35 144 1 722 36 2 4 9 36 144 1 48 3 24 2 12 2 37 144 1 48 3 16 3 4 4 38 144 1 16 98 2 4 2 39 152 1 76 2 4 19 4 1 40 160 1 80 2 40 2 4 10 41 160 1 80 2 204 4 5 42 160 1 32 5 16 2 4 4 43 168 1 84 2 28 3 4 7 44 176 1 88 2 44 2 411 45 184 1 92 2 4 23 4 1 46 192 1 96 2 48 2 4 12 47 192 1 96 2 24 4 4 648 192 1 64 3 16 4 4 4 49 192 1 24 8 8 3 4 2 50 208 1 104 2 52 2 4 13 51216 1 108 2 36 3 4 9 52 224 1 112 2 56 2 4 14 53 240 1 120 2 60 2 4 1554 240 1 80 3 20 4 4 5 55 240 1 48 5 16 3 8 2 56 240 1 24 10 12 2 4 3 57256 1 128 2 64 2 4 16 58 256 1 128 2 32 4 4 8 59 256 1 16 16 8 2 4 2 60264 1 132 2 44 3 4 11 61 272 1 136 2 68 2 4 17 62 272 1 68 4 4 17 4 1 63272 1 16 17 8 2 4 2